Journal of Environmental Chemical Engineering
·
2020
·
IF 4.3
Wenjun Liu,Zhaohui Li
Metallic Au nanoparticles (NPs) are active catalysts in many chemical reactions. However, small-size Au NPs are difficult to obtain since they tend to agglomerate due to their high surface energies. Herein, we reported a facile and green hydrothermal process, using graphene oxide (GO) as the RGO precursor, HAuCl 4 as Au precursor and L-cysteine (L-cys) as both cross-linker and reducing agent, to fabricate an Au/RGO composite aerogel. During the hydrothermal process, the reduction of GO/HAuCl 4 , the oxidation of L-cys to produce disulfide linkage, and the self-assembly of RGO aerogel occurs simultaneously, leading to the resultant RGO aerogels uniformly and intimately embedded with disulfide protected ultrasmall Au NPs with an average size of 1.3 nm. The as-obtained Au/RGO composite aerogel exhibited superior catalytic performance for reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP), with a total transformation of 4-NP achieved in 4 min. The much higher activity over Au/RGO aerogel as compared with unsupported thiol-capped Au NPs can be attributed to the synergistic effect of metallic Au and RGO. Moreover, Au/RGO composite aerogel also showed high stability and can be easily separated from the reaction systems for recycling. No obvious decrease of catalytic reduction activity was observed over the Au/RGO aerogel after five cycles. Considering the high price of metallic Au, the embedding of Au NPs in three-dimensional RGO aerogels to facilitate its recycling is extremely appealing for its practical applications.
研究领域:
材料科学
·
环境化学
✓ 已验证
DOI
高影响因子
Environmental Science-Nano
·
2024
·Vol. 11
·期 7
·3092-3103
·
IF 5.8
Manoj Kumar Panjwani,Feiyu Gao,Ting He,Pan Gao,Feng Xiao,Shaoxia Yang
M–Nx single-atom catalysts (SACs) with a high coordination number (x > 4) are effective catalysts for eliminating organic pollutants, while the origin of SACs with high activity still remains elusive. In this work, we successfully synthesized an Fe–N5 SAC with axial N coordination, which exhibited exceptional catalytic performance by peroxymonosulfate (PMS) activation for degrading 4-chlorophenol (4-CP) in a wide pH range (4.0–10.0). The rate constant of Fe–N5 (2.99 min−1) was 6.36 times higher than that of Fe–N4, and the turnover frequency (TOF) of Fe–N5 was found to be 4–149 times higher than those of state-of-the-art SACs and nanocatalysts reported in the literature for 4-CP degradation by PMS activation. Moreover, Fe–N5 was not significantly affected by coexisting substances (HA, HCO3−, SO42−, H2PO4−, NO3−, and Cl−) and had satisfactory degradation efficiency for various chlorophenols. Electron paramagnetic resonance (EPR), quenching experiments, and radical probe experiments demonstrated that 1O2 played a key role in the Fe–N5/PMS system for 4-CP degradation. Density functional theory calculations confirmed that a narrower gap between the Fe-3d band center and Fermi level enhanced the electron transfer in Fe–N5, which resulted in promoted PMS activation. In addition, the Fe–N5/PMS system showed good potential for application in real wastewater. The above findings offer important implications for the future of coordination chemistry in designing M–Nx–C SACs (x > 4), highlighting their practical applications in environmental remediation.
研究领域:
环境化学
·
催化
·
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
SYNTHETIC METALS
·
2023
·
IF 4.4
Shuai Fu,Yuhui Ma,Zhiyuan Zhang,Yao Xu,Heyi Zhang,Zihan Xiao,Sihao Zhang,Ruidong Xia
A high-quality perovskite film is of great significance for efficient and stable perovskite solar cells (PSCs). The use of additives to improve the crystallinity and morphology of perovskite films is an effective way to improve the performance of PSC devices. In this work, 4-carboxyphenyl isothiocyanate (CPIC) was used as an additive in perovskite films to improve the quality of the films. The results of FT-IR showed that the SCN - and -COOH groups with Lewis base in CPIC can coordinate with unpaired Pb 2+ on the perovskite films to form Lewis acid-base adducts. The addition of CPIC can effectively improve the crystallinity and grain size of the perovskite films. The results showed that the short circuit current density ( J SC ) and fill factor (FF) of PSC devices increase significantly with the improvement of film quality, when the concentration of CPIC is 0.5 mg mL −1 . These made the efficiency of the devices increase from 16.16 % to 18.19 %. Meanwhile, the introduction of the benzene ring in CPIC can improve the stability of the PSC devices. After aging at room temperature and 50 % humidity for 30 days, the device added with CPIC retained 61.9 % of the initial PCE. This work proves that using CPIC as an additive is an effective method to achieve efficient and stable PSCs.
研究领域:
材料科学
·
可再生能源
·
太阳能电池
·
化学
✓ 已验证
DOI
高影响因子
POLYMER
·
2018
·
IF 3.483
Jun Cheng,Zhiqiang Zhang,Wenxin Shi,Ruijun Zhang,Bing Zhang,Xian Bao,Yuan Guo,Fuyi Cui
In this study, 4-dimethylaminopyridine (DMAP) was firstly used as a catalyst in the interfacial polymerization of pentaerythritol (PE) and trimesoyl chloride (TMC) to enhance membrane performance. A series of nanofiltration membranes were prepared using five different DMAP concentrations of 0%, 10%, 20%, 30% and 40% (mass percentage accounting for PE). The filtration test results demonstrated that the water permeability of the typical PE-4 (40% DMAP addition) was 3.47-fold higher than that of the PE-0 (no DMAP addition) with no significant salt rejection loss, indicating that DMAP could effectively improve the water permeability. Characterization by SEM, AFM , and ATR-FTIR indicated that DMAP facilitated the reaction of PE and TMC, which resulted in polyester forming on the surface of the substrate membrane, rather than blocking the membrane pore. Moreover, the PE-DMAP-TMC TFC membrane displayed excellent dye separation performance and high antifouling ability.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Chang Miao,Meiling Ma,Yingrui Sui,Yue Cui,Zhanwu Wang,Lili Yang,Fengyou Wang,Xiaoyan Liu,Bin Yao
Environmentally benign and earth-abundant constituent’s kieserite Cu 2 ZnSn (S, Se) 4 (Cotises) is considered as a hopeful photovoltaic material. Unfortunately, the severe tail state caused by various harmful deep defects in CZTSSe absorber prevents further development of its device efficiency. Here, we report firstly that the Co was incorporated into CZTSSe films to form the Cu 2 Co x Zn 1-x Sn (S, Se) 4 (CCZTSSe) films using a two-step annealing and solution-processing technique method. Through optimized the Co/(Co+Zn) ratio, the CCZTSSe film has excellent good surface morphology and single-phase composition. Appropriate amount of Co elements replacing Zn elements in CZTSSe films can effectively reduce the degree of Cu-Zn disorder, thus inhibiting [2Cu Zn +Sn Zn ] defect clusters and Cu Zn defects. The detrimental deep defects located in the film were effectively passivated to reduce electrostatic potential fluctuations, resulting in relief of the trailing state. Therefore, a champion device having an efficiency of 7.50 % with a fill factor (FF) of 61.00 % was achieved from CCZTSSe with 3 % Co content. This work provides new insights into the impacts of Co doping in CZTSSe by a solution processed method and offers a deeper comprehension of the origin of the efficiency enhancement of CCZTSSe devices.
研究领域:
材料科学
·
能源技术
·
半导体物理
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL ENGINEERING SCIENCE
·
2013
·Vol. 30
·期 6
·294-301
·
IF 1.154
Lejin Xu,Jianlong Wang
Degradation of 4-chloro-3,5-dimethylphenol (PCMX) by a heterogeneous Fenton-like process using nanoparticulate zero-valent iron (nZVI) and hydrogen peroxide (H2O2) at pH 6.3 was investigated. Interactive effects of three factors—initial PCMX concentration, nZVI dosage, and H2O2 concentration—were investigated using the response surface method based on the Box–Behnken design. Experimental results showed that complete decomposition of PCMX and 65% of total organic carbon removal were observed after 30 min of reaction at neutral pH under recommended reaction conditions: nZVI, 1.0 g/L; H2O2, 18 mM; and initial PCMX concentration, 0.15 g/L. Based on the effects of scavengers n-butanol and KI, removal of PCMX was mainly attributed to the attack of •OH, especially the surface-bonded •OH. A possible degradation pathway of PCMX was proposed.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 17
·7035-7041
·
IF 3.288
Mufei Liu,Hao Yang,Zewen Xu,Wenlu Ma,Fang Cui,George Lu,Linxu Xu,Tieyu Cui
Based on green chemistry, 3D hierarchical ZnO microflowers (MFs) constructed from layered 2D nanosheets have been designed as carriers to uniformly load PdO/Pd nanoparticles by the calcination of the precursor (ZnO/Pd(II) microflowers) in air. The ZnO/Pd(II) microflowers are prepared by dipping the 3D ZnO MFs in an ethanolic solution of PdCl2 without involving additional agents. The as-prepared 3D hierarchical ZnO microflowers are a stable support to enhance the dispersibility of PdO/Pd nanoparticles to achieve better catalytic performance for the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP). In addition, the synergistic effect between the PdO and Pd nanoparticles is another major driver that promotes the catalytic process. Over 98% of 4-NP is reduced within 7 min. Furthermore, structural analysis of the ZnO/PdO/Pd microflowers can provide useful information for understanding structure-performance relationships.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2021
·
IF 5.097
Shijian Zhou,Chunxia Liu,Weiming Jin,Lingling Pan,Qichao Jiang,Yingjie Hu,Yan Kong
Noble-metal nanoparticles (NPs), due to their high surface energy, suffer from serious problems, such as ease of agglomeration at high temperatures, which unfortunately causes a significant decline in their original catalytic activity during the reaction and recycling processes. To solve these problems, in this work, a multiple-step synthetic method is proposed to construct an advanced core–shell structure by anchoring ultrasmall Au nanoparticles on the inner surface of mesoporous Co3O4 (m-Co3O4). The m-Co3O4, which has a high surface area, is fabricated by a hard-templating method, and the ultrasmall Au NPs (1.9 nm) are confined to the inner surface of the m-Co3O4. The target sample of Au–m-Co3O4 is found to achieve the highest catalytic efficiency in the probe reaction of the catalytic reduction of 4-nitrophenol to 4-aminophenol, and more importantly, thermal stability tests demonstrate that the Au–m-Co3O4 catalyst is more stable at higher temperatures. Furthermore, DFT calculations have verified that both activated hydrogen adsorption and 4-aminophenol desorption are significantly promoted on the surface of the Au–m-Co3O4 catalyst due to a strong synergetic effect between Au and the m-Co3O4. The construction of this advanced architecture for Au-based catalysts could provide a facile method for stabilizing ultrasmall noble-metal NPs and reasonably designing noble-metal catalysts with desirable activity and stability.
研究领域:
材料科学
·
催化化学
·
理论计算化学
✓ 已验证
DOI
高影响因子
Cell Reports
·
2023
·Vol. 42
·期 11
·113349-113349
·
IF 8.8
Shao Q,Wijaya CS,Wang S,Meng X,Yuan C,Ma C,Xu S
Maintaining cellular viability relies on the integrity of the plasma membrane, which must be repaired upon damage. Soluble N-ethylmaleimide-sensitive factor attachment protein receptor (SNARE)-mediated membrane fusion is a crucial mechanism involved in membrane repair. In C. elegans epidermal cell hyp 7, syntaxin-2 (SYX-2) facilitates large membrane wound repair; however, the underlying molecular mechanism remains unclear. Here, we found that SNAP-25 protein RIC-4 and synaptobrevin protein SEC-22 are required for SYX-2 recruitment at the wound site. They interact to form a SNARE complex to promote membrane repair in vivo and fusion in vitro. Moreover, we found that SEC-22 localized in multiple intracellular compartments, including endosomes and the trans-Golgi network, which recruited to the wounds. Furthermore, inhibition of RAB-5 disrupted SEC-22 localization and prevented its interaction with SYX-2. Our findings suggest that RAB-5 facilitates the formation of the RIC-4/SEC-22/SYX-2 SNARE complex and provides valuable insights into the molecular mechanism of how cells repair large membrane wounds.
研究领域:
细胞生物学
·
分子生物学
·
发育生物学
✓ 已验证
DOI
PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2020
·
IF 3.232
Zhiming Guo,Alberta Osei Barimah,Chuang Guo,Akwasi A. Agyekum,Viswadevarayalu Annavaram,Hesham R. El-Seedi,Xiaobo Zou,Quansheng Chen
Black tea like other food crops is prone to mercury ion (Hg 2+ ) contamination right from cultivation to industrial processing. Due to the dangerous health effects posed even in trace contents, sensitive detection and quantification sensors are required. This study employed the surface-enhanced Raman scattering (SERS) enhancement property of 4-aminothiophenol (4-ATP) as a signal turn off approach functionalized on Ag-Au alloyed nanoparticle to firstly detect Hg 2+ in standard solutions and spiked tea samples. Different chemometric algorithms were applied on the acquired SERS and inductively coupled plasma-mass spectrometry (ICP-MS) chemical reference data to select effective wavelengths and spectral variables in order to develop models to predict the Hg 2+ . Results indicated that Ag-Au/4-ATP SERS sensor combined with ant colony optimization partial least squares (ACO-PLS) exhibited the best correlation efficient and minimum errors for Hg 2+ standard solutions (R c = 0.984, R p = 0.974, RMSEC = 0.157 μg/mL, RMSEP = 0.211 μg/mL) and spiked tea samples (R c = 0.979, R p = 0.963, RMSEC = 0.181 μg/g and RMSEP = 0.210 μg/g). The limit of detection of the proposed sensor was 4.12 × 10 −7 μg/mL for Hg 2+ standard solutions and 2.83 × 10 −5 μg/g for Hg 2+ spiked tea samples. High stability and reproducibility with relative standard deviation of 1.14% and 0.84% were detected. The potent strong relationship between the SERS sensor and the chemical reference method encourages the application of the developed chemometrics coupled SERS system for future monitoring and evaluation of Hg 2+ in tea.
研究领域:
分析化学
·
环境科学
·
食品科学
✓ 已验证
DOI
PubMed
高影响因子
CELLULOSE
·
2023
·Vol. 30
·期 6
·3729-3743
·
IF 5.7
Zhang Cuizhi,Gao Kairu,Chu Xiaomeng,Liu Shaojie,Li Peixin,Tang Erjun
Polyamidoamine (PAMAM) encapsulated nano-Ag is a highly efficient catalyst for the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) in water. However, PAMAM is easily soluble in water, making the nano-Ag catalyst difficult to recycle. In this work, carboxymethyl cellulose (CMC) was oxidized by sodium periodate to obtain oxidized carboxymethyl cellulose (CMC-CHO) containing aldehyde groups. PAMAM encapsulated nano-Ag (G4.0-PAMAM-Ag) was prepared with G4.0-PAMAM as template. Through the Schiff base reaction between CMC-CHO and G4.0-PAMAM-Ag, the CMC/PAMAM hydrogel loaded with nano-Ag (CMC-PAMAM-Ag) was prepared. The catalytic performance of CMC-PAMAM-Ag in the reduction of 4-NP to 4-AP in water was studied. It was found that its time required for accomplishing the reduction reaction was only 9 min, similar to that of free G4.0-PAMAM-Ag (8 min). Turnover frequency was as high as 169 h −1 , much higher than that of the cellulose/PAMAM composite supported nano-Ag (4.2 h −1 ) and dextrann/PAMAM hydrogel supported nano-Ag (40.2 h −1 ). The recovered hydrogel was characterized by X-ray photoelectron spectroscopy and it was found that the imine bonds in the fresh hydrogel were reduced to the amine bonds in the recovered hydrogel, improving the stability of hydrogel. The recovered hydrogel still had a good catalytic performance.
研究领域:
高分子化学
·
环境催化
·
纳米材料
·
水处理
·
绿色化学
✓ 已验证
DOI
高影响因子
Polymers
·
2021
·Vol. 13
·期 15
·2388
·
IF 4.329
Meina Xie,Daikun Jia,Jin Hu,Jiyu He,Xiangmei Li,Rongjie Yang
In this study, the aromatic acetylene compound 4-(phenylethynyl) di(ethylene glycol) phthalate (PEPE) was used as a chain extender, partially replacing 1,4-butanediol. To synthesize an intrinsic flame-retardant thermoplastic polyurethane elastomer (TPU) with an aromatic acetylene structure, PEPE was synthesized by a two-step polymerization. The flame retardancy, thermal stability, and mechanical properties of TPU were studied. The microstructure of TPU char was investigated by scanning electron microscopy to analyze the flame-retardant mechanism. The tensile strength of TPU containing 1.35 wt% PEPE was 39.2 MPa, which was almost twice as much as neat TPU, showed a dramatic decrease in the peak heat release rate and total heat release, and declined by 46.2% and 24.5%, respectively. After the flame-retardant TPU burned, a cross-linked network foaming char structure was formed. The results showed that PEPE improved the mechanical properties of TPU and conferred good stability that promoted the formation of charcoal and reduced heat release during the combustion of TPU.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）